[racket] What #lang to use to create teachpack?

 > I think you will find "#lang racket" the best language for writing
 > teachpacks.

Using "#lang racket" I have successfully create a package, installed
it, and require'd it.  But when I print a structure defined in my
package, the arguments don't print:

   > (require geo)
   > (length geonames)
   10150
   > (first geonames)
   (make-usgs ...)
   > 

I want my students to see the actual arguments rather than ..., as
they would if I had used `define-struct` in ISL.  Is there a
relatively easy way to achieve this?


Norman